Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Laptop tachometer - RPM from Sound


  • Please log in to reply
8 replies to this topic

#1 MFGray OFFLINE  

MFGray

    Member

  • Senior Member
  • Member No: 154
  • 129 Thanks
  • 122 posts
  • Location: Cambridge, Ontario

Posted May 11, 2011 - 02:14 PM

I wanted to share this little piece of software that turns your laptop or pocket PC into a tachometer using the sound of the engine. It can be found at:

www.tunelab-world.com/rpmsound.html

The program is quick to download and straightforward to run. For a four cycle you need to set it at 2 cycles per ignition and about 100Hz frequency. It has one draw back in that you have to preselect the rpm range and the max has to be less than double the minimum, so it needs to be tweaked to get the full range of a GT engine, but if you don't have a tachometer but have a laptop and a microphone (and I guess most of us have those) it gives you a pretty good idea of your engine speed.

I have found it very useful for setting the idle speed and max speed after fiddling with the carburetor. And it's free.

George.
  • ducky, MH81, LPBolens and 4 others have said thanks

#2 wvbuzzmaster OFFLINE  

wvbuzzmaster

    Squeaky Wheel

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1792
  • 4,492 Thanks
  • 7,341 posts
  • Location: West Virginia

Posted May 11, 2011 - 02:49 PM

That sounds cool, but I will have to find a microphone. I can tweak it easily with the manual handheld Tachometer I have on an engine I can get to the shaft, then use it on something like a Case easily.

#3 ducky OFFLINE  

ducky

    Senior Member

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 564
  • 1,623 Thanks
  • 3,860 posts
  • Location: Freedom, WI

Posted May 11, 2011 - 02:58 PM

That should be neat.

#4 NUTNDUN OFFLINE  

NUTNDUN

    Lost in Cyber Space

  • Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 3
  • 10,266 Thanks
  • 15,618 posts
  • Location: Pennsylvania

Posted May 11, 2011 - 03:05 PM

I don't have a laptop or a pocket pc. I would definitely give it a try if I did. They should port it to android and iphone also. Thanks for the great find though.

#5 ducky OFFLINE  

ducky

    Senior Member

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 564
  • 1,623 Thanks
  • 3,860 posts
  • Location: Freedom, WI

Posted May 11, 2011 - 03:22 PM

There is a version for Pocket PC

#6 WQDL753 OFFLINE  

WQDL753

    Bolensholic

  • Senior Member
  • Contributor
  • Member No: 1407
  • 59 Thanks
  • 301 posts
  • Location: Beaver, PA

Posted May 12, 2011 - 01:47 AM

So does this work good with junk mics?
I have a cheap netbook with a built in mic, but I have no idea what the response range is, it might not be rated for 100 Hz.

#7 MFGray OFFLINE  

MFGray

    Member

  • Senior Member
  • Member No: 154
  • 129 Thanks
  • 122 posts
  • Location: Cambridge, Ontario

Posted May 12, 2011 - 04:52 PM

It should work just fine-my mic is as cheap as they come and it works ok.

George
  • WQDL753 said thank you

#8 buck50bmg OFFLINE  

buck50bmg

    Member

  • Member
  • Member No: 5231
  • 1 Thanks
  • 37 posts
  • Location: Washington, Pa

Posted July 31, 2011 - 05:35 AM

Cool, Wish it was for Mac too.

#9 MFGray OFFLINE  

MFGray

    Member

  • Senior Member
  • Member No: 154
  • 129 Thanks
  • 122 posts
  • Location: Cambridge, Ontario

Posted August 07, 2012 - 06:00 PM

This program is available as an app for the iphone, Ipod etc as "Engine RPM" by Real-Time Specialties. It costs a few dollars (under $10 I think), but it seems pretty accurate and it's easy to use. You can watch your engine rpms as you drive, tweak the carb or stand 20 feet away.
  • DH1 said thank you




Top